10 to 20
5 to 10
0.01 to 1
1.5 to 2.5

## Process Equipment and Plant Design For turbulent flow (NRe > 2100) of low viscosity fluid (μ > 20cp) in steel pipes, the optimum inside pipe diameter is given by(where, Q = fluid flow rate, ft³/sec.ρ = fluid density, lb/ft³ μ = fluid viscosity, centipoise Di = optimum inside pipe diameter, inches)

Di, opt = 3.9 Q0.45 . μ0.95
Di, opt = 4.7 Q0.36 . μ3.2ρ0.13
Di, opt = 3 Q0.36 . μ0.88
Di, opt = 3.9 Q0.45 ρ0.13

1/20-1/30th
1/2 to 1/4th
1/5-1/10th
1/10-1/15th

1000
10000
5000
3000

## Process Equipment and Plant Design Which of the following is not a valid assumption in continuous binary distillation for calculating the number of equilibrium stages by Mc-Cabe-Thiele's method?

Sensible heat changes for vapour & liquid are negligibly small
Molar latent heat of the two components are equal
Heat of mixing of normal liquid is assumed to be zero
Reflux is not a saturated liquid

## Process Equipment and Plant Design In a bag filter, the pressure drop increases directly as the

Viscosity of the gas and inversely as density of the gas
None of these
Density of the gas, but is independent of the viscosity of the gas
Density of the gas and inversely as viscosity of the gas